Guillermo Pico-Alonso, MD
NPI 1851381305 · Ophthalmology Physician · Hato Rey, PR
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Guillermo Pico-Alonso, MD is a Ophthalmology Physician provider in Hato Rey, PR (NPI 1851381305).
Provider details
- NPI number
- 1851381305
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 4642 (PR)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 3 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 92 | 33 |
| Timolol Maleate | 18 | — |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 14 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-10-26
- Last updated
- 2024-06-06
- Certified
- 2024-05-30
Frequently asked questions
- What is Guillermo Pico-Alonso's NPI number?
- Guillermo Pico-Alonso's National Provider Identifier (NPI) is 1851381305, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Guillermo Pico-Alonso's specialty?
- Guillermo Pico-Alonso is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Guillermo Pico-Alonso located?
- Guillermo Pico-Alonso's practice location on file with NPPES is Ave Ponce De Leon #715 Pda 37 1/2, Hato Rey, PR 00919-1227.
- What is Guillermo Pico-Alonso's phone number?
- The practice phone number listed in the NPPES registry for Guillermo Pico-Alonso is (787) 409-4275.
- Does Guillermo Pico-Alonso accept Medicare?
- Guillermo Pico-Alonso is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Guillermo Pico-Alonso's NPI active?
- Yes — Guillermo Pico-Alonso's NPI (1851381305) is active in the NPPES registry as of the last update on 2024-06-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.